Gnome
Not just the yanks. In 1974 the RN had civilian apprentices at Fleetlands refurbish a few surplus Gnomes for the Embassy powerboat team.
Have you tried the likes of Vector Aerospace for a hoist? When these former MoD workshops were privatised a lot of the rigs, plant and machinery were transferred to the company, so disposal would be their concern. A Sea King rig would have a functional, although not necessarily serviceable, hoist with minimal practical value. I know new type rigs were bought in about 1996 - the RAF Sea King project manager (a Sqn Ldr) was actually in the Mk3 on the pan when the Nimrod went into the Moray Firth. His boss was hanging out the cargo door looking at the hoist and fell out when the aircraft took off! Best of luck.